Erlangen 2026 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 15: Heavy-Ion Collisions and QCD Phases II
HK 15.2: Talk
Tuesday, March 17, 2026, 16:30–16:45, PHIL C 601
Low-mass, low-momentum virtual photon measurement with HADES — •Iuliana-Carina Udrea for the HADES collaboration — TU Darmstadt/GSI GmbH
Collisions of heavy nuclei at relativistic energies create a hot and dense medium, offering a unique environment to explore its microscopic properties using electromagnetic probes.
Dileptons are particularly advantageous for this purpose, as they do not interact strongly with the surrounding matter, allowing them to carry undisturbed information about the QCD matter produced during the reaction.
In particular, low-invariant-mass and low-momentum dileptons are highly sensitive to the transport properties of the system, providing a means to identify signatures of novel phases, such as precursor phenomena of color superconductivity, in dense QCD matter.
In this contribution, we outline the key steps towards investigating soft dileptons. For this purpose data from Ag+Ag collisions at 1.23A GeV with a nominal magnetic field strength are compared with a reduced magnetic field (5% of Bmax), the latter increasing the acceptance for low-momentum leptons. Additionally, we will present the new data collected in 2025 for Au+Au collisions at 0.8A GeV with a lower magnetic field strength, allowing us to study the low-mass and low-momentum dileptons in more detail.
This work is supported by: GSI F&E and HGS-HIRe.
Keywords: electromagnetic; heavy-ion collisions; low-mass low-momentum dileptons